Percy is confused. When he awoke after his long sleep, he didnt know much more than his name. His brainfuzz is lingering, even after the wolf Lupa told him he is a demigod and trained him to fight. Somehow Percy managed to make it to the camp for halfbloods, despite the fact that he had to continually kill monsters that, annoyingly, would not stay dead. But the camp doesnt ring any bells with him.